I need help hooking up Merlin vsm mme Bam to avr

If you only use a single source i.e. CD player only, put the BAM between the CD player and the pre-amp. Output from your CD player to the input of the BAM, output from the BAM to the input of your pre-amp. You will need one extra pair of interconnects.

If you use multiple sources and your pre has tape in and tape out rca's on the back. Using two pairs of interconnects, take the pre's tape out put into the BAM's input, take the BAM's output and connect it to the pre's tape input.

If you use multiple sources and your pre does not have tape in and tape out rca connections, connect the pre-amps output to the BAM's input, connect the BAM's output to the amplifier's rca inputs.

The terminals on the back of the BAM are not positive or negative, they are either left or right channel. Just make sure the left output of the AVR is connected to the left input of the BAM.

In most amps, the right channel can be identified with a red marking, perhaps this is causing the confusing with the +'ve -'ve.

1) CD Player right channel output to BAM right channel input.

2) BAM right channel output to AVR CD right channel input.

Repeat for left channel.

I am glad that it worked out for you.

Yes, the BAM has a subtle affect on the sound that allows the listener to become more deeply engaged in the music without the worry of fatigue.